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Mechanical Properties of Fluids
Question
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Why ends/edges of glass become round on heating?

Answer

Molten gas tries to acquire the minimum surface area and hence heats up due to surface tension. Rounding off the edges makes them acquire the minimum surface area. 

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Some More Questions From Mechanical Properties of Fluids Chapter

Do intermolecular or inter-atomic forces follow inverse square law?

Why solids have definite shape while liquids do not have definite shape?

What is fluid?

What is hydrostatics?

What is hydrodynamics?

Can fluids withstand tangential stress?

Can fluids withstand normal stress?

Why the fluids do not have any modulus of rigidity?

Which phase of fluid is more compressible?

What is an ideal liquid?